"Use a white light switch cover and decorate your own with sharpies!" Look, I tried decorating something with horizontal Sharpie patterns and it did NOT look like this. Also, do you really want to buy all those colored Sharpies? give your room color.
Variegated yarn granny squares by Barbara McMannaman pinned from FB, The Crochet Crowd (Barbara McManaman "This is a typical granny square. 8 rows of the variegated color and one row of black in a J hook.